DIY Reusable Humidifier Filter

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Hi everyone! I know I haven’t blogged in a while, but I’ve so been busy! I wanted to share a simple practical thing that I made.
We always run our humidifier in winter to make the air more tolerable. The replacement filters used to work great, but we’ve noticed the last few we bought are really poor quality. We used to be able to rinse and reuse them easily, but now they disintegrate. It’s like they used to be made with plastic and now they use cardboard, which degrades when wet. So, with my knitting prowess :), I decided to knit a reusable cotton filter!
This is our humidfier. It’s a Honeywell (model HCM-6013IC), and we have no complaints about it except the filters. But if you have a different model, I bet you can adapt my filter to work with yours!

First, I decided to make a wooden frame for the filter to hang on.

The filter is round, so I cut two half circles and joined them, then added posts to stand on. If I did it again, I would be a little more careful about how I joined the two half-circles. I did not drill large enough pilot holes, so when I put the second screw in, the wood cracked. 😦 Next, I knitted the filter! Here I am trying out the filter (knitting needles still attached).

A little detail for the knitters out there: I used ordinary worsted-weight cotton,the exact same yarn you would make washcloths out of. I used 8 mm needles for knitting in the round, which makes a very holey fabric. Whatever you use needs to wick water well (say that three times fast!) and have lots of holes for air to move through. I think I cast on about 95 stitches, but since everyone’s gauge is different, you ought to knit a swatch, measure your filter/humdifier and cast-on accordingly. 🙂 Message me if you need help with this step — I’d be happy to help!

The filter works great! We soaked it thoroughly and hung it over the frame with the ends dangling in the water tray. It works great and should be almost infinitely reusable! This is the filter about two months later. Still going strong, and I’m so glad we don’t have to buy those disposable ones anymore!


If you have a similar humidifier, you have GOT to make something similar and leave a comment when you do!

2 thoughts on “DIY Reusable Humidifier Filter

    joanne seto said:
    February 18, 2021 at 1:42 pm

    I don’t knit , but I love this idea of reusing. You are a inventive.

      Teresa responded:
      March 10, 2021 at 12:34 pm

      If you know a knitter, they could pretty easily make this for you! 🙂

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